CN216767563U - Gas turbine waste heat recovery system based on transcritical carbon dioxide circulation - Google Patents
Gas turbine waste heat recovery system based on transcritical carbon dioxide circulation Download PDFInfo
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- CN216767563U CN216767563U CN202122762030.4U CN202122762030U CN216767563U CN 216767563 U CN216767563 U CN 216767563U CN 202122762030 U CN202122762030 U CN 202122762030U CN 216767563 U CN216767563 U CN 216767563U
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Abstract
The utility model discloses a waste heat recovery system of a gas turbine based on transcritical carbon dioxide circulation, which comprises a gas turbine system, a supercritical carbon dioxide power circulation waste heat recovery system, a transcritical carbon dioxide power circulation waste heat recovery system and a transcritical carbon dioxide refrigeration circulation waste heat recovery system, the high-temperature heater is used for carrying out primary waste heat recovery on the discharged smoke, the heater is used for realizing secondary waste heat recovery, the utilization rate of energy is improved, LNG is used as a cooling medium before entering the combustion chamber, high-quality cold energy is applied to the whole waste heat recovery system, the self temperature is improved by absorbing heat, sufficient preparation is made for entering a combustion chamber, the energy of LNG in different states is fully utilized, carbon dioxide is used as a working medium, can be collected from the atmospheric environment, has low recovery cost, and can reduce the content of environmental carbon dioxide after being recycled.
Description
Technical Field
The utility model relates to the field of energy recycling systems, in particular to a waste heat recycling system of a gas turbine based on transcritical carbon dioxide circulation.
Background
At present, the exhaust gas temperature of the gas turbine is high, generally 450 ℃ to 600 ℃, a large amount of recoverable heat is carried, and if the exhaust gas is directly discharged into the environment, a large amount of energy loss is caused.
The fuel commonly used by the gas turbine is natural gas, the temperature of Liquefied Natural Gas (LNG) is about-161 ℃, a large amount of high-quality cold energy is carried, and how to more effectively utilize the cold energy of LNG before the LNG enters a combustion chamber is also needed to be worth deeply researching.
Disclosure of Invention
In order to overcome the defects of the prior art, the utility model provides a method.
The technical scheme adopted by the utility model for solving the technical problems is as follows:
the utility model provides a gas turbine waste heat recovery system based on transcritical carbon dioxide circulation, includes gas turbine system, supercritical carbon dioxide power cycle waste heat recovery system, transcritical carbon dioxide power cycle waste heat recovery system and transcritical carbon dioxide refrigeration cycle waste heat recovery system:
the gas turbine system comprises a plenum chamber, a combustion chamber and a gas turbine;
the supercritical carbon dioxide power cycle waste heat recovery system comprises a compressor, wherein an outlet of the compressor is connected with a cold side inlet of a heat regenerator, a cold side outlet of the heat regenerator is connected with a high-temperature heater, the high-temperature heater is connected with a high-temperature turbine, the high-temperature turbine is connected with a hot side inlet of the heat regenerator, a hot side outlet of the heat regenerator is connected with a precooler, and the precooler is connected with the compressor.
The transcritical carbon dioxide power cycle waste heat recovery system comprises a first booster pump, wherein the first booster pump is connected with the precooler, the precooler is connected with a bottom circulation turbine, the bottom circulation turbine is connected with a condenser, and the condenser is connected with the first booster pump.
The transcritical carbon dioxide refrigeration cycle waste heat recovery system comprises an evaporator, wherein the evaporator is connected with a first four-way reversing valve, the first four-way reversing valve is connected with a heater, the heater is connected with a second four-way reversing valve, the second four-way reversing valve is connected with a gas-liquid separator, a second booster pump and a gas cooler, the gas-liquid separator is communicated with the second booster pump, the gas cooler is connected with a subcooler, the subcooler is connected with a third four-way reversing valve, the third four-way reversing valve is connected with a throttle valve, and the throttle valve is communicated with the evaporator.
And the high-temperature flue gas discharged by the gas turbine sequentially passes through the high-temperature heater and the heater to recover waste heat.
The waste heat recovery system further comprises an LNG storage tank, the LNG storage tank is connected with the precooler, and low-temperature natural gas in the LNG storage tank sequentially passes through the precooler and the subcooler and enters the combustion chamber.
The LNG storage tank is characterized in that a first fuel regulating valve is arranged at an outlet of the LNG storage tank, a second fuel regulating valve is arranged between the precooler and the subcooler, the first four-way reversing valve is further connected with a low-temperature turbine, and the low-temperature turbine is respectively communicated with the evaporator and the heater through conversion of the first four-way reversing valve.
The utility model has the beneficial effects that:
1. according to the utility model, the high-temperature heater is used for carrying out primary waste heat recovery on the discharged smoke, and the heater is used for realizing secondary waste heat recovery, so that the utilization rate of energy is improved.
2. Before the LNG enters the combustion chamber, the LNG serves as a cooling medium, high-quality cold is applied to the whole waste heat recovery system, the temperature of the LNG is increased by absorbing heat, sufficient preparation is made for the LNG to enter the combustion chamber, and the energy of the LNG in different states is fully utilized.
3. The utility model adopts carbon dioxide as working medium, can be collected from the atmospheric environment, has low recovery cost, and can reduce the content of environmental carbon dioxide after being recycled.
Drawings
The utility model is further illustrated with reference to the following figures and examples.
Fig. 1 is a schematic structural view of the present invention.
Detailed Description
Referring to fig. 1, a gas turbine waste heat recovery system based on transcritical carbon dioxide circulation includes a gas turbine system, a supercritical carbon dioxide power circulation waste heat recovery system, a transcritical carbon dioxide power circulation waste heat recovery system and a transcritical carbon dioxide refrigeration circulation waste heat recovery system:
the gas turbine system comprises a plenum chamber 1, a combustion chamber 2 and a gas turbine 3;
the supercritical carbon dioxide power cycle waste heat recovery system comprises a compressor 4, wherein an outlet of the compressor 4 is connected with a cold side inlet of a heat regenerator 5, a cold side outlet of the heat regenerator 5 is connected with a high-temperature heater 6, the high-temperature heater 6 is connected with a high-temperature turbine 7, the high-temperature turbine 7 is connected with a hot side inlet of the heat regenerator 5, a hot side outlet of the heat regenerator 5 is connected with a precooler 8, and the precooler 8 is connected with the compressor 4.
The supercritical carbon dioxide power cycle adopting the high-temperature heater and the heat regenerator can efficiently convert the waste heat of the gas turbine into mechanical work of the turbine, the number of devices used by the system is small, the cost of a lot of devices can be reduced, and high exhaust waste heat can be reserved to provide sufficient heat sources for the next refrigeration cycle.
The transcritical carbon dioxide power cycle waste heat recovery system comprises a first booster pump 9, wherein the first booster pump 9 is connected with a precooler 8, the precooler 8 is connected with a bottom circulation turbine 10, the bottom circulation turbine 10 is connected with a condenser 11, and the condenser is connected with the first booster pump 9.
By adopting the transcritical carbon dioxide power cycle of the precooler 8 and the condenser 11, the cold energy in the LNG can be utilized primarily.
The transcritical carbon dioxide refrigeration cycle waste heat recovery system comprises an evaporator 12, the evaporator 12 is connected with a first four-way reversing valve 13, the first four-way reversing valve 13 is connected with a heater 14, the heater 14 is connected with a second four-way reversing valve 17, the second four-way reversing valve 17 is connected with a gas-liquid separator 15, a second booster pump 16 and a gas cooler 18, the gas-liquid separator 15 is communicated with the second booster pump 16, the gas cooler 18 is connected with a subcooler 19, the subcooler 19 is connected with a third four-way reversing valve 20, the third four-way reversing valve 20 is connected with a throttle valve 21, and the throttle valve 21 is communicated with the evaporator 12.
By utilizing the transcritical carbon dioxide refrigeration cycle, the waste heat of the gas turbine can be further fully utilized, and meanwhile, the working medium at the inlet of the evaporator 12 can be cooled at a lower temperature by utilizing the lower temperature of LNG in the condensation process, so that more refrigerating capacity is achieved.
The total system uses LNG for cold energy power generation and supercooling to cool carbon dioxide, and the loss of LNG cold energy is reduced.
The high-temperature flue gas discharged by the gas turbine sequentially passes through the high-temperature heater 6 and the heater 14, and waste heat is recovered.
The waste heat recovery system further comprises an LNG storage tank 22, the LNG storage tank 22 is connected with the precooler 8, and low-temperature natural gas in the LNG storage tank 22 sequentially passes through the precooler 8 and the subcooler 19 and enters the combustion chamber 2.
The outlet of the LNG storage tank 22 is provided with a first fuel regulating valve 24, and a second fuel regulating valve 25 is arranged between the precooler 8 and the subcooler 19
The first four-way reversing valve 13 is further connected with a low-temperature turbine 23, and the low-temperature turbine 23 is respectively communicated with the evaporator 12 and the heater 14 through the switching of the first four-way reversing valve 13.
Through the conversion of the second four-way reversing valve 17, the interconversion of the refrigeration cycle and the heat engine cycle of the transcritical carbon dioxide refrigeration cycle waste heat recovery system can be realized, the functions can be flexibly changed according to the environmental conditions and the living and production requirements, and the flexibility is increased.
Refrigeration cycle: the low temperature working medium absorbs heat in the evaporator 12 to evaporate, and then the low temperature working medium enters the heater 14 to absorb heat of flue gas to raise temperature, and then the second booster pump 16 boosts pressure and temperature of the working medium, and the working medium is in a high temperature and high pressure supercritical state, and then the gas cooler 18 cools the high temperature and high pressure gas with equal pressure, but not to cool the high temperature and high pressure gas to a temperature lower than the critical point (the temperature of the outlet of the cooler can be controlled to 45 ℃), the low temperature and high pressure working medium is sent into the subcooler 19 to be subcooled and cooled by LNG, so that the circulating refrigerating capacity is increased on the basis of basic circulation, the subcooled and cooled working medium enters the throttle valve 21 to expand with equal enthalpy, the working medium at the outlet of the throttle valve 21 is cooled and depressurized to be a low temperature and low pressure gas-liquid mixture, and the temperature and the pressure at the time are lower than the critical point, however, a large amount of heat of the circulation is lost in the gas cooler part, therefore, the gas cooler can collect heat with working medium water and use the heat for life heat supply.
Heat engine cycle: working medium carbon dioxide is followed pressure boost is sent to in the second booster pump 16 heater 14, and the carbon dioxide temperature pressure after the heating all exceeds the critical point, becomes the carbon dioxide of supercritical state, and high temperature high pressure carbon dioxide promotes low temperature turbine 23 does work, turns into mechanical energy with heat energy, the carbon dioxide of low temperature turbine 23 export is sent to evaporator 12 gives the space heat supply of evaporator 12 opposite side to according to the required temperature regulation heat transfer volume in the space in evaporator 12, the carbon dioxide is exothermic for the first time, arrives subcooler 19 then releases heat once more, is the secondary heat release this moment, and the heat of giving out can be given LNG to heat, and the carbon dioxide after the secondary heat release can flow through gas cooler 18 further releases heat, flows to at last gas-liquid separator 15.
The above embodiments do not limit the scope of the present invention, and those skilled in the art can make equivalent modifications and variations without departing from the overall concept of the present invention.
Claims (6)
1. The utility model provides a gas turbine waste heat recovery system based on transcritical carbon dioxide circulation, includes gas turbine system, supercritical carbon dioxide power cycle waste heat recovery system, transcritical carbon dioxide power cycle waste heat recovery system and transcritical carbon dioxide refrigeration cycle waste heat recovery system, its characterized in that:
the gas turbine system comprises a plenum chamber (1), a combustion chamber (2) and a gas turbine (3);
the supercritical carbon dioxide power cycle waste heat recovery system comprises a compressor (4), wherein an outlet of the compressor (4) is connected with a cold side inlet of a heat regenerator (5), a cold side outlet of the heat regenerator (5) is connected with a high-temperature heater (6), the high-temperature heater (6) is connected with a high-temperature turbine (7), the high-temperature turbine (7) is connected with a hot side inlet of the heat regenerator (5), a hot side outlet of the heat regenerator (5) is connected with a precooler (8), and the precooler (8) is connected with the compressor (4);
the transcritical carbon dioxide power cycle waste heat recovery system comprises a first booster pump (9), wherein the first booster pump (9) is connected with the precooler (8), the precooler (8) is connected with a bottom cycle turbine (10), the bottom cycle turbine (10) is connected with a condenser (11), and the condenser is connected with the first booster pump (9);
the transcritical carbon dioxide refrigeration cycle waste heat recovery system comprises an evaporator (12), the evaporator (12) is connected with a first four-way reversing valve (13), the first four-way reversing valve (13) is connected with a heater (14), the heater (14) is connected with a second four-way reversing valve (17), the second four-way reversing valve (17) is connected with a gas-liquid separator (15), a second booster pump (16) and a gas cooler (18), the gas-liquid separator (15) is communicated with the second booster pump (16), the gas cooler (18) is connected with a subcooler (19), the subcooler (19) is connected with a third four-way reversing valve (20), the third four-way reversing valve (20) is connected with a throttle valve (21), and the throttle valve (21) is communicated with the evaporator (12).
2. The waste heat recovery system according to claim 1, wherein the high temperature flue gas discharged from the gas turbine passes through the high temperature heater (6) and the heater (14) in sequence to recover waste heat.
3. The waste heat recovery system according to claim 1, further comprising an LNG storage tank (22), wherein the LNG storage tank (22) is connected to the precooler (8), and the low-temperature natural gas in the LNG storage tank (22) sequentially passes through the precooler (8) and the subcooler (19) and enters the combustor (2).
4. Waste heat recovery system according to claim 3, characterized in that the outlet of the LNG storage tank (22) is provided with a first fuel regulating valve (24), and a second fuel regulating valve (25) is provided between the precooler (8) and the subcooler (19).
5. The waste heat recovery system according to claim 1, wherein the first four-way reversing valve (13) is further connected with a low-temperature turbine (23), and the low-temperature turbine (23) is respectively communicated with the evaporator (12) and the heater (14) through conversion of the first four-way reversing valve (13).
6. The heat recovery system of claim 1, wherein the third four-way selector valve (20) is switchable to directly communicate the subcooler (19) and the evaporator (12).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122762030.4U CN216767563U (en) | 2021-11-12 | 2021-11-12 | Gas turbine waste heat recovery system based on transcritical carbon dioxide circulation |
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| CN202122762030.4U CN216767563U (en) | 2021-11-12 | 2021-11-12 | Gas turbine waste heat recovery system based on transcritical carbon dioxide circulation |
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